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14. TROUBLESHOOTING PROBLEMS
possibly caused by loose connections, long wire runs, small wire gauge, faulty wiring, a faulty voltmeter or all the above. Consult the
Suggested Minimum Wire Gauge chart in Section 6 for wiring suggestions and check all connections.
For advanced users:
The GP-PWM-30-UL makes voltage measurement adjustments based on resistance it detects at the battery terminals. In addition to
resistance in the wires, batteries also have an internal resistance due to chemical properties. The controller cannot distinguish between
these two sources of resistance. It will compensate up to 250mV in the displayed value.
What causes a warning signal and when are the warnings triggered?
CONNECTION
Battery 1 reverse polarity
Battery 2 reverse polarity
PV reverse polarity
PV short circuit
Why does the voltage fluctuate so much when charging with the LFP setting?
Lithium batteries contain smaller battery cells. The voltages of these individual cells must be balanced during the charging process by
the Battery Management System (BMS). Imbalances will cause fluctuations in the battery voltage measurement, but this will stabilize
as the cells are charged and balanced.
Additionally, lithium batteries have higher resistance than lead acid batteries. This affects the charge controller's battery voltage mea-
surements and its compensation for wire resistance.
Reduce wire inductance which may also cause voltage fluctuations. Keep battery wires close together, or gently twist positive and
negative wires together.
I don't see my charge controller in the Device Selection screen of the Go Power! Connect app.
The Device Selection screen will only display a charge controller that has already paired with the mobile device or a charge controller
that is in the pairing process. The pairing process is initiated by pressing simultaneously the A and B buttons for 3 seconds. This is
needed only when the mobile device is connecting with the charge controller for the first time.
I cannot connect to the Go Power! Connect app.
The mobile device with the Go Power! Connect app has to be close enough to the charge controller. Distances of up to 20 meters in
open space should work.
14. TROUBLESHOOTING PROBLEMS
How to Read this Section
Troubleshooting Problems is split into three sub-sections, grouped by symptoms involving key components. Components considered
irrelevant in a diagnosis are denoted 'Not Applicable' (N/A). A multimeter or voltmeter may be required for some procedures listed.
IIt is imperative all electrical precautions stated in the Warning Section and outlined in the Installation Section are followed. Even if it
appears the system is not functioning, it should be treated as a fully functioning system generating live power.
WARNING
"POL" on LCD and constant
audible alarm
Battery 2 status display
doesn't show
"POL" on LCD and constant
audible alarm
NOTES
Battery 1 must be connected
with correct polarity for unit to
be powered on
Unit shows moon symbol
when PV is connected and in
bright sunlight
LCD
POL
POL
*must have bright
sunlight on PV too
gpelectric.com | [page 23]
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